Bug 331337 s390x WARNING: unhandled syscall: 326 (dup3)

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13820 a5019735-40e9-0310-863c-91ae7b9d1cf9
Make these buildable on arm64-linux.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13821 a5019735-40e9-0310-863c-91ae7b9d1cf9
First attempt at supporting sys_clone.
Also enable: sys_exit, sys_nanosleep, sys_madvise.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13822 a5019735-40e9-0310-863c-91ae7b9d1cf9
arm64-linux: make restarting of syscalls interrupted by signals work


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13823 a5019735-40e9-0310-863c-91ae7b9d1cf9
Enable sys_ppoll, sys_kill, sys_socketpair.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13824 a5019735-40e9-0310-863c-91ae7b9d1cf9